linux-ext4 - Re: [PATCH 2/2] tune2fs/fuse2fs/debugfs: save error information during journal replay

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Date:   Fri, 17 Feb 2023 12:11:00 +0100
From:   Jan Kara <jack@...e.cz>
To:     Baokun Li <libaokun1@...wei.com>
Cc:     linux-ext4@...r.kernel.org, tytso@....edu,
        adilger.kernel@...ger.ca, jack@...e.cz, yi.zhang@...wei.com,
        yangerkun@...wei.com, yukuai3@...wei.com
Subject: Re: [PATCH 2/2] tune2fs/fuse2fs/debugfs: save error information
 during journal replay

On Fri 17-02-23 18:09:22, Baokun Li wrote:
> Saving error information during journal replay, as in the kernel,
> prevents information loss from making problems difficult to locate.
> We save these error information until someone uses e2fsck to check
> for and fix possible errors.
> 
> Signed-off-by: Baokun Li <libaokun1@...wei.com>

Looks good to me. Feel free to add:

Reviewed-by: Jan Kara <jack@...e.cz>

								Honza

> ---
>  debugfs/journal.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
> 
> diff --git a/debugfs/journal.c b/debugfs/journal.c
> index 5bac0d3b..79e3fff8 100644
> --- a/debugfs/journal.c
> +++ b/debugfs/journal.c
> @@ -789,6 +789,8 @@ errcode_t ext2fs_run_ext3_journal(ext2_filsys *fsp)
>  	char *fsname;
>  	int fsflags;
>  	int fsblocksize;
> +	char *save;
> +	__u16 s_error_state;
>  
>  	if (!(fs->flags & EXT2_FLAG_RW))
>  		return EXT2_ET_FILE_RO;
> @@ -808,6 +810,12 @@ errcode_t ext2fs_run_ext3_journal(ext2_filsys *fsp)
>  	if (stats && stats->bytes_written)
>  		kbytes_written = stats->bytes_written >> 10;
>  
> +	save = malloc(EXT4_S_ERR_LEN);
> +	if (save)
> +		memcpy(save, ((char *) fs->super) + EXT4_S_ERR_START,
> +		       EXT4_S_ERR_LEN);
> +	s_error_state = fs->super->s_state & EXT2_ERROR_FS;
> +
>  	ext2fs_mmp_stop(fs);
>  	fsname = fs->device_name;
>  	fs->device_name = NULL;
> @@ -818,11 +826,15 @@ errcode_t ext2fs_run_ext3_journal(ext2_filsys *fsp)
>  	retval = ext2fs_open(fsname, fsflags, 0, fsblocksize, io_ptr, fsp);
>  	ext2fs_free_mem(&fsname);
>  	if (retval)
> -		return retval;
> +		goto outfree;
>  
>  	fs = *fsp;
>  	fs->flags |= EXT2_FLAG_MASTER_SB_ONLY;
>  	fs->super->s_kbytes_written += kbytes_written;
> +	fs->super->s_state |= s_error_state;
> +	if (save)
> +		memcpy(((char *) fs->super) + EXT4_S_ERR_START, save,
> +		       EXT4_S_ERR_LEN);
>  
>  	/* Set the superblock flags */
>  	ext2fs_clear_recover(fs, recover_retval != 0);
> @@ -832,6 +844,9 @@ errcode_t ext2fs_run_ext3_journal(ext2_filsys *fsp)
>  	 * the EXT2_ERROR_FS flag in the fs superblock if needed.
>  	 */
>  	retval = ext2fs_check_ext3_journal(fs);
> +
> +outfree:
> +	free(save);
>  	return retval ? retval : recover_retval;
>  }
>  
> -- 
> 2.31.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR